shurtleff



APPLICATIONTILED SEPT. 22.1018.

Patexited May 27; 1919'.

2 SHEETSSHEET I 1.- NORRIS PETERS co. Pnormuma, WASNINGRIN. n. n

W. SHURTLEFF. ANTISIPHON SEAL FOR HEATING SYSTEMS.

APPLICATION FILED SEPT. 27, I918 Patented May 27, 19 19.

2 SHEETS-SHEET 2- w l mum w iv 2 F1 \lio W e llll s :air. relief valve (not shown).

UNITED STATES-PATENT onrron. I

WILFBED SHURTLEFF, or, MOLINE, ILLINOIS, AssIeNon r MOLINE HEAT, or MOLINE,

ILLINOIS, A CORPORATION or ILLINOIS.

ANTISIPHON-SEAL FOR HEATING SYSTEMS.

Specification of Letters Patent.

Patented May 27, 1919.

Application filed September 27, 1918. Serial No. 255,966.

To all whom it may concern:

,Be it known that I, WILFRED SHun'rLnrr', a citizen of the UnitedStates, and a resident of Moline, in the eounty'of Rock Island and State of Illinois, have invented certain new and useful Improvements in Antisiphon-Sea-ls for Heating Systems, of which the following is a specification.

My invention relates toanti-siphon seals for heating systems, its objectbeing to pro duce improved construction and arrangement which will permit more efficient operation of the seal and which will render the seal more accessiblefor inspection or renewals.

The various features of my invention will be apparent from the following specificationta-ken with the accompanying drawings in which drawings.. 7

Figure'l is an elevational view' of a seal,

Fig; 2 is an enlarged plan view thereof,

" "Fig. 3 is an enlarged sectional View on plane 33, Fig. 2, and

Fig. 4: is a sectional Fig. 3.

The cylindrical body 5 of the seal structure is of pipe-shape and rests at its lower end on the cylindrical base part 6, the top of view on plane H7 -the base having the annular flange 7 within which the lower end of the body part seats, preferably with the interposition 'of the gasket '8. At the top' of the body part is supported the cap 9, the cap having the internal alining flange 10 and the gasket '11 being interposed between the cap and body. In the top of the cap is the central passageway 12 for the bolt 13 whose lower end threads through the boss 14 formed at the center of the top wall 15 of the base 6. This bolt securely ties the head, body and base parts together into a rigid structure.

Depending from the top wall ofthe cap are a number of bosses orlugs 16 each having a passageway therethroug'h' tapped in its outer part for securing pipe sections 17, and also tapped at their inner ends for supporting drop pipes 18. In practice the pipes 17 are connected by unions 19 with the drips 20 leading from the low pressure supply and return mains or the air and water return main of a heating system. Another tap opening 21 is also shown from which a pipe 22 extends tobe connected by a union 23 withthe drip pipe 24 leadin from the sacred in 'sageways 30 the lower end of the tap 21' is the drop pipe 25. The side of the cap has the threaded opening 26 in which is secured the pipe stub 27 connected by coupling 28 with the pipe 29 which connects with the pump and water'receiver. i

The various drop pipes 18 and "extend downwardly to within a short distance of the bottom of the base6, the top wall 15 of the basev having the openings 30 therethrough. through which the pipes extend,

these openings being a trifle larger than the pipes to more or less restrict the flow of water between the base and the body'parts of the sealstr-ucture. 'The drip water from the variouspipes of the heating system soon fill the seal well and the overflow returning through pipe 29 to the 'water'receiver. In order to prevent siphoning of the sealan air intake pipe 31 is connected with the interior of the cap 9 above the water level, and has acheck valve 32 at its end which is set so that air may be drawn into the space above the water. This check valve will also prevent the escape of any steam which may reach the space above the water.

The'water of condensation coming from the steam supply mains is muchhigher in temperature than the water of condensation coming from the air I and Water return mains. As these waters are both discharged into the base 6 of'the seal there is a tenddifierence in presency, on account of the sure, to create what is called water bubbles. Unless guarded against these water bubbles interfere with the proper functioning of the seal and the steam would not be held back. The formation of water bubbles is prevented in my improved seal by the restricted paswhich provide] a practically closed water chamber a-t'the lower end of the seal. Thewaters of different temperatureflowing into this lower chamber Will be retained and retarded and will mix to a great extent before rising through the-restricted passageways into the bodysection 5 of the seal, such passage through the restricted passageways causing the further and practically complete mixture of the waters of different temperature and the formation of water bubbles is prevented. -'The base section 6 acts also as a mud drum, clean-out plugs 33 and34c being provided.

improved construction inwhich the cap, bedy and base parts are separably held able for use in steam or together by a bolt 13 eliminates the need of pits or sewer tiles for installing the seals. The seals can be buried directly in the ground. Upon loosening of the various unions and unscrewing of the bolt 13 the cap with the drop pipe-s thereon can be withdrawn from the seal body and inspection, renewals, or repairs can readily and quickly be made. In order to strengthen against strain caused by the bolt 13 the wall 15 of the base part 6 is reinforced by ribs 35.

My improved seal is particularly adaptvapor heating systems where the pressure is substantially the same as that of the atmosphere or only a few pounds thereover. I do not desire to be limited to the exact details of construction and arrangement shown and described as modifications are no doubt possible which would still come within the scope of the invention. I claim as follows:

1. In a device of the class described, the combination of a well comprising upper and lower compartments, drop pipes extending through the upper compartment and into the lower compartment, there being only restricted passageway between said compartments.

2. In a device of the class described, the combination of a well comprising upper and lower compartments, the upper wall of said lower compartment having passageways, drop pipes extending downwardly through said upper compartment and through said passageways into the lower compartments for discharging water into the lower compartment, said passageways restricting the flow of water between the compartments, and an overflow outlet at the upper end of the upper compartment.

3. In a device of the class described, the combination of a base part having passageways in its upper wall, a body part mounted on and secured to said base part, drop pipes suspended from the top of said body part and extending downwardly through said passageways and into the base part, th relative sizes of said passageways and said pipes passing therethrough being such that the flow between the base part and the body part is restricted, and an overflow outlet from the top of the body part.

4. In a device of the class described, the combination of a base part, a body part mounted thereon, a screw extending centrally through saidbody part and threading into the base part to secure said parts together, drop pipes extending through the body part and into the base part, and an overflow outlet at the upper end of said body part.

5. A device of the class described comprising a base part, a body part and a cap part, a bolt connecting said cap part with the basepart to lock said parts together to 'form a well, and drop pipes extending through said body and base parts, there being an overflow outlet from said cap part.

6. A device ofthe class described comprising a base part, a body part and a cap part, sald parts being det'achably held together to form a well, drip pipes adapted at their upper ends for connection with piping of a heating system andextending downwardly through said body part into the base part, there being an overflow outlet'from the cap art. p 7 A device of the class described comprising a base part, a body part and a cap part, a bolt extending through the parts and connecting with the cap part and base parts to clamp the body part therebetween, said parts forming a well, drip pipes suspended from the cap part and extending through the body part into the base part, and an overflow outlet from the upper end of said well.

8. A'device of the class described comprising a base part, a body part and a cap part, a bolt extending axially through said parts with its head engaging the cap part and its threaded end engaging in the upper wall of the base part whereby said cap, body and base part are clamped together in axial alinement to form a well,-drop pipes extending from the cap part through the body part v and through the upper wall of the'base'part into the interior of said base part, there being restricted passageway through the upper wall of said base part for the flow of water between said base and body parts, and an ,100 overflow outlet at .theup-per end of the well.

9. A device of the class described comprising a base part,-a body partand a cap part, a single bolt looking said parts together in axial alinement, drop pipes sec1 05 cured to the cap part and extending down- 'wardly through the body part and into the base part, there being an, overflow outlet at the upper part of th well.

10. In a device of the class described, the .110 combination of a base part, a top part mounted on said base part, drop pipes extending through said top part and intothe base part, a water outlet at the upper end of said top part, restricted passageway for water flow between said base part and top part, said base part except for said restricted passage-way being entirely closed and forming-a mixing chamber for water received through said .drop pipes.

11; In a device of the class described, the combination of a base part, a .top part mounted on said base part, drop pipes ex 7 tending through said top part and into the base, part, a water outlet at the upper end of said top part, restricted passageway for water flow between said base part and the top part, said base part except for said restrictedi passageway being entirely closed and forming a mixing chamber. for water .1280

received through said drop pipes, an air in- 13. A device of the class described comlet to said top part above the water level prising a well having a chamber near its bot- 15 therein for preventing siphoning, and a tom connected only by restricted passagecheck valve for preventing outward flowway with the space above, drop pipes exthrough said-inlet. tending downwardly through said well to 12, A device of the class described coindischarge into the bottom chamber, an overprising a well having-a chamber near its flow outlet at the upper end of said well, and 20" bottom connected only by restricted passageanair inlet to the space above the Water way with the space above, drop pipes exlevel. tending downwardly through said well to In witness whereof, I hereunto subscribe discharge into the bottom chamber, and an my name'this 24th day of September, A. D. overflow outlet at the upper end of said 1918.

( WILFRED SHURTLEFF-.-

well.

copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. '0. 

